You may have already tried PGP/GPG public key encryption for documents or mail, but do you know what’s going on under the hood and what level of security you’re actually getting? We take an in-depth look at GnuPG encryption.

Practical cryptography is often an encounter with many random numbers in just a few moments. Entropy is the raw material that gives birth to the random number, but it’s harder to come by than you might think.